#LLD-HLD

# Topic covered
* Software Engineering
  * History of software engineering
* Software Development Life Cycle(SDLC)
* SDLC Phases
* SDLC Models
  * Classical Waterfall model
  * Iterative Waterfall Model
  * Prototype Model
  * Incremental Model
  * Spiral Model
  * Agile Model

# Topic covered
* Software Testing
* Type of Software testing
  * Manual, Automation
* Software Testing types based on Levels
  * Unit, Integration, System, Regression
* Test Case design approach
  * AKA - Software Testing Techniques
  * White, Black, Gray box testing
* Test Driven Development (TDD)
  * Shift Left in Software Testing
  * Shift Right in Software Testing

# Topic covered
* When should you start learning System Design?
* High-Level Design (HLD)
* Low-Level Design (LLD)
* Differences Between HLD and LLD
* Macro vs. Micro Architecture and Design
* LLD and HLD Roadmap

# Topic covered
* First Principles
* The stack
  * Clean Code
  * Programing Paradigms
  * Object Oriented Programming
  * Design Principles
  * Design Patterns
  * Architectural Principles
  * Architectural Styles
  * Architecture Patterns
  * Enterprise Patterns

# Topic covered
* Clean Code
* Why Clean Code?
* Why write bad code?
* Meaningful Names
* Functions rules
* Comments rules
* Code smells

# Topic covered
* Classes, Objects
* Inheritance, Polymorphism

# Topic covered
* SOLID Principles
* Issue with BAD Code
* Motivation behind the usage of SOLID Principles
* SOLID
  * Single Responsibility Principle (SRP) 
  * Open closed Principle (OSP)
  * Liskov substitution Principle (LSP)
  * Interface Segregation Principle (ISP)
  * Dependency Inversion Principle (DIP)

# Topic covered
* Design Pattern
* Design Pattern vs Algorithms
* Classification of patterns
  * Creational patterns
  * Structural patterns
  * Behavioral patterns

6. Creational Patterns

Creational pattern provides various object creation mechanisms, which increase flexibility and reuse of existing code.

• Factory Method Design Pattern - Class
• Builder Design Pattern
• Singleton Design Pattern
• Prototype Design Pattern
• Abstract Factory Design Pattern

7. Structural Pattern

• Adapter Design Pattern
• Bridge Design Pattern
• Composite Design Pattern
• Decorator Design Pattern
• Flyweight Design Pattern
• Proxy Design Pattern
• Facade Design Pattern